Friction-improved polymers for dlc-coated surfaces

2:

• The element of claim 1, wherein the DLC layer comprises carbon present in a graphite structure, wherein a proportion of the carbon present in a graphite structure, based on an overall amount of carbon, is in a range from 30 to 70 mol %.

3:

• The element of claim 1, wherein the DLC layer comprises carbon present in a diamond structure, wherein a proportion of the carbon present in a diamond structure, based on an overall amount of carbon, is in a range from 30 to 70 mol %.

4:

• The element of claim 1, wherein a thickness of the DLC layer is in a range from 1 to 20 μm.

5:

• The element of claim 1, wherein the polymer is a graft copolymer where a graft layer comprises the repeat unit derived from the amine derivative of the polar ethylenically unsaturated monomer, the amine derivative being derived from a primary amine.

6:

• The element of claim 1, wherein the polar ethylenically unsaturated monomer from which the amine derivative is derived is maleic acid, maleic anhydride or a maleic acid derivative.

7:

• The element of claim 1, wherein the polar ethylenically unsaturated monomer from which the amine derivative is derived is a (meth)acrylate having an epoxide group.

8:

• The element of claim 1, wherein the amine derivative of the polar ethylenically unsaturated monomer is derived from an amine comprising at least two amino groups, one amino group being a primary amino group and at least one amino group being a secondary amino group.

9:

• The element of claim 1, wherein the polymer comprises 0.1 to 10% by weight of the repeat unit derived from the amine derivative of the polar ethylenically unsaturated monomer.

10:

• The element of claim 1, wherein the polymer is a polyolefin.

11:

• The element of claim 1, wherein the polymer is a polyalkyl(meth)acrylate.

12:

• The element of claim 1, which is an engine.

13:

• The element of claim 12, wherein at least one of the components movable with respect to one another is a camshaft or a valve.

14:

• The element of claim 1, wherein the amine derivative of the polar ethylenically unsaturated monomer is derived from an amine having a formula R5—NH—R6—NH2 in which R5 is a radical having 1 to 18 carbon atoms and R6 is a radical having 2 to 18 carbon atoms.

15:

• The element of claim 14, wherein at least one of the R5 and R6 radicals is an aromatic or heteroaromatic group.

16:

• The element of claim 1, wherein the amine derivative of the polar ethylenically unsaturated monomer is derived from an amine having a formula (IIIa)
• in which R′ and R″ are each independently H or an alkyl radical having 1 to 9 carbon atoms.

17:

• The element of claim 2, wherein the DLC layer comprises carbon present in a diamond structure, wherein a proportion of the carbon present in a diamond structure, based on the overall amount of carbon, is in a range from 30 to 70 mol %.

18:

• The element of claim 14, wherein R5 is a radical having 1 to 10 carbon atoms.

19:

• The element of claim 14, wherein R6 is a radical having 2 to 10 carbon atoms.

20:

• The element of claim 14, wherein R5 is a radical having 1 to 10 carbon atoms, and R6 is a radical having 2 to 10 carbon atoms.